GB1262380A - Flaw detection in laminated structures using vibration response - Google Patents

Flaw detection in laminated structures using vibration response

Info

Publication number
GB1262380A
GB1262380A GB25742/69A GB2574269A GB1262380A GB 1262380 A GB1262380 A GB 1262380A GB 25742/69 A GB25742/69 A GB 25742/69A GB 2574269 A GB2574269 A GB 2574269A GB 1262380 A GB1262380 A GB 1262380A
Authority
GB
United Kingdom
Prior art keywords
frequency
panel
signal
transducer
core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB25742/69A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boeing Co
Original Assignee
Boeing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boeing Co filed Critical Boeing Co
Publication of GB1262380A publication Critical patent/GB1262380A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
    • G01N29/075—Analysing solids by measuring propagation velocity or propagation time of acoustic waves by measuring or comparing phase angle
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/24—Probes
    • G01N29/2412—Probes using the magnetostrictive properties of the material to be examined, e.g. electromagnetic acoustic transducers [EMAT]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/023—Solids
    • G01N2291/0231—Composite or layered materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/042—Wave modes
    • G01N2291/0421—Longitudinal waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/10—Number of transducers
    • G01N2291/102—Number of transducers one emitter, one receiver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/26—Scanned objects
    • G01N2291/263—Surfaces
    • G01N2291/2632—Surfaces flat

Landscapes

  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

1,262,380. Acoustic inspection of laminated structures; ultrasonic probes. BOEING CO. 20 May, 1969 [20 May, 1968], No. 25742/69. Headings H4D and H4J. Apparatus for detecting flaws in a laminated panel comprises a first transducer capable of inducing physical vibrations at a frequency f in a localized area of the panel when energized with an electrical signal of frequency f/n (n being an integer), a second transducer disposed close to the first for sensing panel vibrations, and a frequency selector which passes frequency f signal components from the second transducer to an indicator but rejects signal components of frequency f/n. In the Fig. 1 embodiment panel P comprises a honeycomb core 10 bonded to aluminium skin layers 12, 14. A probe electromagnet 16 on ferromagnetic core 18 in dielectric housing 22 is energized with an oscillatory signal of selectable frequency f 1 by source 24 which may be pulsed by interrupter 25. Eddy currents in skin 12 set up panel vibrations of frequency 2f 1 which are sensed by the probe's capacitance microphone 26 overlying a bore 20 through core 18 and housing 22. Signal components at the energizing frequency f 1 in the microphone output are rejected by tuned amplifier 42 and the 2f 1 components are fed to the Y-plates of oscilloscope 44, the X-plates of which receive the electromagnet energizing signal whereby phase changes indicative of disbonds can be detected from the Lissajou pattern display as the probe is moved over the panel. The X-plate signal may also be frequencydoubled and phase-compared with the Y-plate signal in a phase-difference meter circuit. The pulsing of source 24 broadens the vibration frequency spectrum and permit testing of a wide range of panel types. The microphone output amplitude may be monitored on an R.M.S. indicating meter. In the Fig. 2 embodiment the electromagnet is replaced by a magnetostrictive transducer with coupling horn 64, and a further sensing transducer 55 (e.g. a contact type) may be used to measure the through-transmission of energy to detect a crushed core.
GB25742/69A 1968-05-20 1969-05-20 Flaw detection in laminated structures using vibration response Expired GB1262380A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US73028068A 1968-05-20 1968-05-20

Publications (1)

Publication Number Publication Date
GB1262380A true GB1262380A (en) 1972-02-02

Family

ID=24934686

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25742/69A Expired GB1262380A (en) 1968-05-20 1969-05-20 Flaw detection in laminated structures using vibration response

Country Status (4)

Country Link
US (1) US3564903A (en)
JP (1) JPS5016668B1 (en)
FR (1) FR2008919B1 (en)
GB (1) GB1262380A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2559154A (en) * 2017-01-27 2018-08-01 Gm Global Tech Operations Llc Testing device with a specimin, manufacturing plant for the manufacturing of the specimen and use of the testing device

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937065A (en) * 1971-09-01 1976-02-10 William Moore Delamination detector
US4100808A (en) * 1975-10-22 1978-07-18 Vought Corporation Apparatus for evaluating a bond
US4184373A (en) * 1975-10-22 1980-01-22 Vought Corporation Apparatus for evaluating a bond
US4037479A (en) * 1975-12-01 1977-07-26 Chemetron Corporation Method and apparatus for sensor assembly inspection
US4043179A (en) * 1976-07-09 1977-08-23 Ingle Jr Harold R Non-destructive testing of bonding laminates
US4122724A (en) * 1977-06-24 1978-10-31 The Boeing Company Swept frequency audible bond tester
US4231259A (en) * 1978-08-11 1980-11-04 Thiruvengadam Alagu P Method and apparatus for non-destructive evaluation utilizing the internal friction damping (IFD) technique
US4215583A (en) * 1978-11-14 1980-08-05 Ndt Instruments, Inc. Apparatus and method for bondtesting by ultrasonic complex impedance plane analysis
US4235110A (en) * 1979-01-12 1980-11-25 Electric Power Research Institute Apparatus and method for measuring the crevice gap clearance in a heat exchanger
US4479386A (en) * 1983-02-10 1984-10-30 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Insulation bonding test system
GB2144853B (en) * 1983-08-10 1987-01-14 Rolls Royce Component inspection by self generated transient stress wave detection
US4549437A (en) * 1983-09-27 1985-10-29 Weins Janine J Acoustic testing of complex multiple segment structures
FR2663115B1 (en) * 1990-06-08 1994-04-15 Framatome METHOD AND DEVICE FOR CONTROLLING THE THICKNESS AND THE COHESION OF THE INTERFACE OF A DUPLEX TUBE.
US5423223A (en) * 1993-02-12 1995-06-13 The United States Of America As Represented By The Secretary Of The Air Force Fatigue detection in steel using squid magnetometry
US5652389A (en) * 1996-05-22 1997-07-29 The United States Of America As Represented By The Secretary Of Commerce Non-contact method and apparatus for inspection of inertia welds
US5814729A (en) * 1996-09-09 1998-09-29 Mcdonnell Douglas Corporation System for in-situ delamination detection in composites
US6843130B2 (en) 2002-12-03 2005-01-18 The Boeing Company System and method for the inspection of adhesive
US7574915B2 (en) * 2006-12-28 2009-08-18 The Boeing Company Simplified impedance plane bondtesting inspection
DE102009006905A1 (en) * 2008-09-29 2010-04-15 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method for quality testing of adhesive bonds
IL247408B (en) 2016-08-21 2018-03-29 Elbit Systems Ltd System and method for detecting weakening of the adhesion strength between structural elements
CN112147218B (en) * 2019-06-28 2021-12-07 中国商用飞机有限责任公司 Air coupling ultrasonic detection method for vertical honeycomb splicing interface

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2559154A (en) * 2017-01-27 2018-08-01 Gm Global Tech Operations Llc Testing device with a specimin, manufacturing plant for the manufacturing of the specimen and use of the testing device

Also Published As

Publication number Publication date
DE1925627A1 (en) 1969-11-13
DE1925627B2 (en) 1976-11-25
FR2008919A1 (en) 1970-01-30
US3564903A (en) 1971-02-23
JPS5016668B1 (en) 1975-06-14
FR2008919B1 (en) 1974-05-31

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